Chapter 8 · The Imperishable Absolute · Krishna said
Bhagavad Gita 8.22 — Undivided devotion
पुरुषः स परः पार्थ भक्त्या लभ्यस्त्वनन्यया। यस्यान्तःस्थानि भूतानि येन सर्वमिदं ततम् ॥
puruṣaḥ sa paraḥ pārtha bhaktyā labhyastvananyayā | yasyāntaḥsthāni bhūtāni yena sarvamidaṃ tatam ||
Meaning
That Supreme Person, in whom all beings dwell and by whom all this is pervaded, is reached only by undivided devotion, Partha.